Draft wamr modifications + host program structure sections

chapters/05_experiment_setup/listings/wamrmodulecall.cpp

@@ -0,0 +1,23 @@
+// Error handling is omitted
+char error_buf[128];
+
+wasm_module_t module = wasm_runtime_load(
+  module_array, module_array_length, error_buf, sizeof(error_buf));
+
+wasm_module_inst_t module_inst = wasm_runtime_instantiate(
+  module, STACK_SIZE, HEAP_SIZE, error_buf, sizeof(error_buf));
+
+wasm_exec_env_t exec_env = wasm_runtime_create_exec_env(
+  module_inst, STACK_SIZE);
+
+wasm_function_inst_t func = wasm_runtime_lookup_function(
+  module_inst, "wasm_module");
+
+// Arguments can be supplied to the function
+// by passing a pointer to an args buffer.
+// No arguments are set here, but a single
+// slot is reserved for the return value.
+uint32_t argv[1];
+uint32_t argc = 0;
+wasm_runtime_call_wasm(exec_env, func, argc, argv);
+uint32_t retval = argv[0];